No clue about their canister filters. I have been using 4 of their 800 gph power heads for years and they keep on working.
The thing about canister filters is maintenance. To be successful in salt water and use a canister filter you need to do a lot of regular maintenance. The nature of canister filters makes this labor intensive. The nature of people results in not enough maintenance because it is a lot of work and kind of messy. I'd recommend a hang on the back filter. Still needs maintenance but the filter is much more accessible and easier to maintain.